Light bulbs are one of those circuit elements we pretend are perfect, but they aren’t. Tungsten filaments have a low resistance when cold, which causes a bulb to draw a lot of current when it ...

While a tungsten light bulb's filament is much warmer than its surroundings, Planck's law offers a good approximation of the spectrum of photons it emits. The new study from the University of ...

incandescent lamps with tungsten filaments appear on the European market. These bulbs lasted longer, were brighter and more efficient than lamps with carbon filaments. 1908: Edison screws Part of ...